Compositional layering in Io driven by magmatic segregation and volcanism

Magmatic segregation and volcanic eruptions transport tidal heat from Io's interior to its surface. Several observed eruptions appear to be extremely high temperature (\(\geq\) 1600 K), suggesting either very high degrees of melting, refractory source regions, or large amounts of viscous heatin...

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Bibliographic Details
Published in:arXiv.org 2020-08
Main Authors: Spencer, Dan C, Katz, Richard F, Hewitt, Ian J, May, David A, Keszthelyi, Laszlo
Format: Article
Language:English
Subjects:
Ascent
Differentiation
High temperature
Mantle
Volcanic activity
Volcanic eruptions
Online Access:Get full text
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Summary:Magmatic segregation and volcanic eruptions transport tidal heat from Io's interior to its surface. Several observed eruptions appear to be extremely high temperature (\(\geq\) 1600 K), suggesting either very high degrees of melting, refractory source regions, or large amounts of viscous heating on ascent. To address this ambiguity, we develop a model that couples crust and mantle dynamics to a simple compositional system. We analyse the model to investigate chemical structure and evolution. We demonstrate that magmatic segregation and volcanic eruptions lead to differentiation of the mantle, the extent of which depends on how easily high temperature melts from the more refractory lower mantle can migrate upwards. We propose that Io's highest temperature eruptions originate from this lower mantle region, and that such eruptions act to limit the degree of compositional differentiation.
ISSN:2331-8422
DOI:10.48550/arxiv.2007.00610